Fix #6950, work around IE missing innerHTML on SVG nodes (#6982)

* Workaround IE lacking innerHTML on SVG elements

* Add tests for setInnerHTML

* Correctly check if node has innerHTML property

* Ensure tests for setInnerHTML actually tests both codepaths

* Provide mock element for setInnerHTML tests

* Only use SVG setInnerHTML workaround for SVG elements

src/renderers/dom/client/utils/DOMLazyTree.js

@@ -12,6 +12,7 @@
 'use strict';
 
 var DOMNamespaces = require('DOMNamespaces');
+var setInnerHTML = require('setInnerHTML');
 
 var createMicrosoftUnsafeLocalFunction = require('createMicrosoftUnsafeLocalFunction');
 var setTextContent = require('setTextContent');
@@ -50,7 +51,7 @@ function insertTreeChildren(tree) {
       insertTreeBefore(node, children[i], null);
     }
   } else if (tree.html != null) {
-    node.innerHTML = tree.html;
+    setInnerHTML(node, tree.html);
   } else if (tree.text != null) {
     setTextContent(node, tree.text);
   }
@@ -96,7 +97,7 @@ function queueHTML(tree, html) {
   if (enableLazy) {
     tree.html = html;
   } else {
-    tree.node.innerHTML = html;
+    setInnerHTML(tree.node, html);
   }
 }
 

src/renderers/dom/client/utils/__tests__/setInnerHTML.js

@@ -0,0 +1,42 @@
+/**
+ * Copyright 2016-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @emails react-core
+ */
+
+'use strict';
+
+var setInnerHTML = require('setInnerHTML');
+var DOMNamespaces = require('DOMNamespaces');
+
+describe('setInnerHTML', function() {
+  describe('when the node has innerHTML property', () => {
+    it('sets innerHTML on it', function() {
+      var node = document.createElement('div');
+      var html = '<h1>hello</h1>';
+      setInnerHTML(node, html);
+      expect(node.innerHTML).toBe(html);
+    });
+  });
+
+  describe('when the node does not have an innerHTML property', () => {
+    it('sets innerHTML on it', function() {
+      // Create a mock node that looks like an SVG in IE (without innerHTML)
+      var node = {
+        namespaceURI: DOMNamespaces.svg,
+        appendChild: jasmine.createSpy(),
+      };
+
+      var html = '<circle></circle><rect></rect>';
+      setInnerHTML(node, html);
+
+      expect(node.appendChild.calls.argsFor(0)[0].outerHTML).toBe('<circle></circle>');
+      expect(node.appendChild.calls.argsFor(1)[0].outerHTML).toBe('<rect></rect>');
+    });
+  });
+});

src/renderers/dom/client/utils/setInnerHTML.js

@@ -12,12 +12,16 @@
 'use strict';
 
 var ExecutionEnvironment = require('ExecutionEnvironment');
+var DOMNamespaces = require('DOMNamespaces');
 
 var WHITESPACE_TEST = /^[ \r\n\t\f]/;
 var NONVISIBLE_TEST = /<(!--|link|noscript|meta|script|style)[ \r\n\t\f\/>]/;
 
 var createMicrosoftUnsafeLocalFunction = require('createMicrosoftUnsafeLocalFunction');
 
+// SVG temp container for IE lacking innerHTML
+var reusableSVGContainer;
+
 /**
  * Set the innerHTML property of a node, ensuring that whitespace is preserved
  * even in IE8.
@@ -28,7 +32,19 @@ var createMicrosoftUnsafeLocalFunction = require('createMicrosoftUnsafeLocalFunc
  */
 var setInnerHTML = createMicrosoftUnsafeLocalFunction(
   function(node, html) {
-    node.innerHTML = html;
+    // IE does not have innerHTML for SVG nodes, so instead we inject the
+    // new markup in a temp node and then move the child nodes across into
+    // the target node
+    if (node.namespaceURI === DOMNamespaces.svg && !('innerHTML' in node)) {
+      reusableSVGContainer = reusableSVGContainer || document.createElement('div');
+      reusableSVGContainer.innerHTML = '<svg>' + html + '</svg>';
+      var newNodes = reusableSVGContainer.firstChild.childNodes;
+      for (var i = 0; i < newNodes.length; i++) {
+        node.appendChild(newNodes[i]);
+      }
+    } else {
+      node.innerHTML = html;
+    }
   }
 );